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<p>Even if one answers 4 questions incorrectly, that is only -5 raw score. 7 incorrect answers yield a raw score of -8.75, which is rounded to -9.</p>
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That’s personal preference. Cynosuree is absolutely correct that it is always statiscally smarter to guess. However, keep in mind that CB always plants at least one “trick” answer that looks extremely appealing.</p>